Method of forming covers for electrical equipment

Details Method of forming covers for electrical equipment Method of forming covers for electrical equipment

1976-09-30

1978-04-04

Dipalma, Victor A.

Metal working

Method of mechanical manufacture

Electrical device making

174 35CE, 228125, 228155, 228170, 228174, H01B 1300

Patent

active

040819000

ABSTRACT:
A method for forming an electrical equipment cover, whose temperature will not appreciably increase when used in an environment of high-strength, time-varying magnetic fields, is provided. The cover is formed from a strong, relatively inexpensive magnetic steel which would ordinarily become heated in such an environment by hysteresis and eddy current losses. In order to prevent this heating, a circular blank or disk of this steel is determined and cut. Selected segments of the blank are removed to form slots in a polygonal pattern concentric with the disk and to form slots along a diameter of the disk or circular blank. All of the slots are filled with strips of a non-magnetic metal, preferably of low electrical resistance, which are then welded to the disk or circular blank. The welds are then ground to smooth the surface of the circular blank. Openings for current-carrying bushings are established in the blank to connect ends of adjacent slots. The cover is then formed and the current-carrying bushings are attached.

REFERENCES:
patent: 2718542 (1955-09-01), Lapsley
"Influence of Flux on Circuit-Breaker Top Design," The Electric Journal, vol. XXVI, No. 6, June 1928.

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